Why is capacity sometimes expressed in litres?
Because capacity is a measure of volume, its scientifically correct unit of measure is the cubic centimetre (cm3 or cc). Alternatively, the litre (i.e. the unit of measure of capacity, according to the metric system) can be used to classify motorcycles, based on the equivalence (referred to water) of 1 litre = 1 dm3 = 1000 cm3. Therefore, a 500 cc bike can be referred to as a “half litre” while a 250 cc bike will be a “quarter of a litre”.
